Jayco Jay Flight Bungalow · 2021–202540LOFT

The Jay Flight Bungalow 40LOFT is one of Jayco's Jay Flight Bungalow destination trailers, the largest and most residential end of the Jay Flight range, built to be parked for a season rather than moved every weekend. This page covers one model year of it — the 2025 40LOFT, exactly as Jayco published it — because the numbers that decide whether your truck can pull this trailer are not the same from one year to the next. Jayco publishes it at 8' 6" wide closed and 13' 6" with the slide-outs run out for the 2025 model year, which is the measurement that matters for a site pitch as well as for the road.

For the 2025 model year Jayco published a 13,950-pound GVWR on a 11,925-pound dry weight, 2,025 pounds of published cargo capacity, a 1,595-pound dry tongue weight. That dry tongue is 13% of the dry weight, inside the 10–15% band conventionally quoted for a bumper-pull trailer. Tongue weight is not fixed — it moves with how the trailer is loaded, and weight added ahead of the axles raises it. A tongue load in that range wants a weight-distribution hitch, and the tow vehicle's tongue-weight limit is a separate number from its trailer-weight limit — check the loaded tongue against the hitch receiver's rating and the vehicle's payload, not against the tow rating alone. The 2025 trailer left the factory on ST235/80R16'E' tyres; the load range in that code is part of the axle rating and a replacement set has to match it.

Against the 2024 build of the same floorplan, 8 published fields moved. The full comparison is in section 02, and it is drawn from two separate verified factory records rather than from one record and an assumption about the other.

A 2025 trailer is close to current as of 2026, but section 05 still applies: check it against its build date rather than its model year. Jayco commonly builds a model year well before the calendar year turns, and the tyre date codes have to be read against the build month, not the badge.

How the 40LOFT differs from the other 122 Jay Flight floorplans. Most distinctive first. Sibling pages may cover other model years than this one (2021–2025). How these ranks are worked out.

• Dry weight, 11,925 lb: fourth-heaviest of 123, between the 402DLFT (11,910 lb) and the 40LSDL (11,940 lb).
• GVWR, 13,950 lb: fourth-highest of 123, between the 402DLFT (13,700 lb) and the 40LSDL (14,000 lb).
• Dry tongue weight, 1,595 lb: sixth-heaviest of 122, between the 40DLFT (1,550 lb) and the 40FKDS (1,600 lb).
• Exterior height, 12 ft 7 in: sixth-tallest of 109, between the 40LSDL (12 ft 4 in) and the 401LOFT, 402DLFT and 404LOFT (12 ft 10 in).
• Length, 40 ft 10 in: eighth-longest of 123, between the 38BHDS and 402RLTS (40 ft 6 in) and the 40FKDS (41 ft).
• Cargo capacity as a share of GVWR, 14.5%: tenth-smallest of 123, between the 40RLTS (14.4%) and the 40LSDL (14.7%).
• Grey tank, 65 gal: shared with the 40LSDL and JAYLOFT; of 118, 97 smaller and eighteen larger, nearest the 130RDW, 172DBW and seventeen others (40 gal) and the 333BTS, 334RTS and two others (71.5 gal).
• Dry tongue weight as a share of dry weight, 13.4%: shared with the 262RLSW, 267BHSW and 285BHS; of 122, 94 smaller and 24 larger, nearest the 38FDDS (13.3%) and the 324BDS and 34RLOK (13.5%).
• Fresh tank, 51 gal: 31st-smallest of 123, between the 242BHS, 263RBS and 295BHS (38 gal) and the 200MKS, 210QB and 48 others (52 gal).
• Interior height, 6 ft 8 in: 33rd-lowest of 123, between the 40LSDL (6 ft 7 in) and the 200MKS, 200MKSW and 77 others (6 ft 9 in).
• Cargo capacity, 2,025 lb: shared with the 290RLS; of 123, 90 smaller and 31 larger, nearest the 330TBS (2,020 lb) and the 211MBW (2,035 lb).
• Sleeping capacity, 8: shared with the 178DBS, 178DBSW and seventeen others; of 110, 59 smaller and 31 larger, nearest the 38BHDS, 402DLFT and 40DLFT (7) and the 264BH, 264BHW and three others (9).

Next to the 402DLFT (2027 page), the nearest lighter floorplan by dry weight, the 40LOFT is 15 lb heavier by dry weight, has a GVWR 250 lb higher, has 235 lb more cargo capacity, has a dry tongue weight 150 lb heavier, is 8 in shorter, stands 3 in lower, has 2 ft 3 in less interior height, has a fresh tank 1 gal smaller, has a grey tank 32.5 gal larger and sleeps one more; the two publish the same black tank.

Next to the 40LSDL (2024 page), the nearest heavier floorplan by dry weight, the 40LOFT is 15 lb lighter by dry weight, has a GVWR 50 lb lower, has 35 lb less cargo capacity, is 1 ft 1 in shorter, stands 3 in taller, has 1 in more interior height, has a fresh tank 1 gal smaller and sleeps two fewer; the two publish the same grey tank and black tank.

This floorplan has a published factory record for 4 model years here, 2021 to 2025. The specification does not hold still: GVWR runs from 13,350 lb (2021) to 13,950 lb (2025); dry weight runs from 11,345 lb (2023) to 11,925 lb (2025); dry tongue weight runs from 1,450 lb (2023) to 1,605 lb (2021). The published sleeping capacity changes across the years: 6-8 in 2021, up to 8 in 2023–2025. Each year’s complete record is printed separately below, carrying only that year’s own published figures and source. Nothing is copied across from a neighbouring year.

Jayco changed 8 of the published fields between the 2024 and 2025 40LOFT. Every figure in both columns is that model year's own factory record — nothing here is carried across from the other year.

A full 51-gallon fresh tank is about 423 lb of water (water counts as cargo: 49 CFR 571.120 S10.4.2), 21% of the 40LOFT’s 2,025 lb cargo capacity, leaving 1,602 lb (200 lb per rated berth). Across 123 Jay Flight floorplans the water share runs 13% to 47%, and 104 give up more than this one. Nearest on that share: Jay Flight 242BHS at 21% and Jay Flight 40LSDL at 21%. Your own unit’s figure is on the label inside its entry door (49 CFR 571.120 S10.4.3).